Bug 943883 - DevTools themes - theme sidemenuwidget, r=bgrins, australis

--HG--
rename : browser/themes/osx/devtools/itemArrow-ltr.png => browser/themes/shared/devtools/images/itemArrow-ltr.png
rename : browser/themes/osx/devtools/itemArrow-rtl.png => browser/themes/shared/devtools/images/itemArrow-rtl.png
Bug 868045 - At some threshold, we should convert MS to Seconds in the Waterfall, r=rcampbell